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random: Fix unknown mt_srand() compatibility for unknown modes #13544

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Merged
merged 1 commit into from
Feb 29, 2024
+33 −1
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random: Fix unknown mt_srand() compatibility for unknown modes #13544

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4 changes: 4 additions & 0 deletions NEWS
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,10 @@ PHP NEWS
. Fixed bug GH-13354 (pg_execute/pg_send_query_params/pg_send_execute
with null value passed by reference). (George Barbarosie)

- Random:
. Fixed bug GH-13544 (Pre-PHP 8.2 compatibility for mt_srand with
unknown modes). (timwolla)

- Standard:
. Fixed array key as hash to string (case insensitive) comparison typo
for the second operand buffer size (albeit unused for now). (A. Slepykh)
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8 changes: 7 additions & 1 deletion ext/random/random.c
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Expand Up @@ -688,7 +688,13 @@ PHP_FUNCTION(mt_srand)
Z_PARAM_LONG(mode)
ZEND_PARSE_PARAMETERS_END();

state->mode = mode;
switch (mode) {
case MT_RAND_PHP:
state->mode = MT_RAND_PHP;
break;
default:
state->mode = MT_RAND_MT19937;
}

if (ZEND_NUM_ARGS() == 0) {
php_random_mt19937_seed_default(status->state);
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22 changes: 22 additions & 0 deletions ext/random/tests/01_functions/mt_srand_unknown_mode.phpt
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@@ -0,0 +1,22 @@
--TEST--
mt_srand(): Test unknown modes
--FILE--
<?php
// MT_RAND_MT19937
mt_srand(1, 0);
var_dump(mt_rand());
// MT_RAND_PHP
mt_srand(1, 1);
var_dump(mt_rand());
// Unknown
mt_srand(1, 2);
var_dump(mt_rand());
// Equivalent to 0 when cast as unsigned 8-bit integer
mt_srand(1, 256);
var_dump(mt_rand());
?>
--EXPECT--
int(895547922)
int(1244335972)
int(895547922)
int(895547922)